Fig. 2From: Performance characteristics of the digital uMI550 PET/CT system according to the NEMA NU2-2018 standarduMI550 count-rate performance. a The measured count-rate curves of prompt, delayed, scatter, true, and NEC rates. b Scatter fraction curve (solid line) in dependency on activity concentration. c The maximum and minimum relative count-rate error curves for difference activity radio concentration. b, c also plotted NECR curve (dotted line) by using double Y axesBack to article page